Class 10 Current Electricity Mock Test (ICSE)

Topics in Current Electricity

• Ohm's law
• Resistance and resistivity
• Series and parallel combinations of resistors
• EMF, terminal voltage and internal resistance
• Electrical energy and power

Current Electricity practice questions with answers

1. Q1Multiple choice·1 mark
   A cell of internal resistance $r$ and EMF $E$ is connected across an external resistor $R$. The terminal voltage $V$ of the cell is given by:

   1. (a)$V = E - Ir$
   2. (b)$V = E + Ir$
   3. (c)$V = I(R + r)$
   4. (d)$V = E$
   Show answer and step marks

   1. Correct option: (a) $V = E - Ir$. When a current is drawn from a cell, the terminal voltage is less than the EMF due to the potential drop across the internal resistance.+1

   Answer: (a)
2. Q2Multiple choice·1 mark
   An electric bulb is rated $220\,\text{V}, 100\,\text{W}$. What is the resistance of its filament?

   1. (a)$22\,\Omega$
   2. (b)$48.4\,\Omega$
   3. (c)$484\,\Omega$
   4. (d)$2.2\,\Omega$
   Show answer and step marks

   1. Correct option: (c) $484\,\Omega$. Using $R = \frac{V^2}{P} = \frac{220^2}{100} = \frac{48400}{100} = 484\,\Omega$.+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   Which of the following graphs correctly represents Ohm's law for a metallic conductor at constant temperature?

   1. (a)A hyperbola
   2. (b)A parabola
   3. (c)A straight line passing through the origin
   4. (d)A straight line parallel to the current axis
   Show answer and step marks

   1. Correct option: (c) A straight line passing through the origin, showing that current is directly proportional to potential difference ($V \propto I$).+1

   Answer: (c)

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